Texas Instruments TI-92 Calculator User Manual


 
122 Chapter 6: Basic Function Graphing
06BASFUN.DOC TI-89/TI-92 Plus: Basic Function Graphing (English) Susan Gullord Revised: 02/23/01 4:09 PM Printed: 02/23/01 4:18 PM Page 122 of 22
Press
from the Graph screen.
Math Tool Description
Value
Evaluates a selected
y(x)
function at a specified
x
value.
Zero,
Minimum,
Maximum
Finds a zero (x-intercept), minimum, or maximum
point within an interval.
Intersection
Finds the intersection of two functions.
Derivatives
Finds the derivative (slope) at a point.
f(x)dx
Finds the approximate numerical integral over an
interval.
Inflection
Finds the inflection point of a curve, where its
second derivative changes sign (where the curve
changes concavity).
Distance
Draws and measures a line between two points on
the same function or on two different functions.
Tangent
Draws a tangent line at a point and displays its
equation.
Arc
Finds the arc length between two points along a
curve.
Shade
Depends on the number of functions graphed.
¦
If only one function is graphed, this shades the
function’s area above or below the x axis.
¦
If two or more functions are graphed, this shades
the area between any two functions within an
interval.
Using Math Tools to Analyze Functions
On the Graph screen, the
Math
toolbar menu has several
tools that help you analyze graphed functions.
Overview of the
Math Menu
Note: For Math results,
cursor coordinates are
stored in system variables
xc and yc (rc and
q
c if you
use polar coordinates).
Derivatives, integrals,
distances, etc., are stored in
the system variable
sysMath.
On the Derivatives submenu,
only dy/dx is available for
function graphing. The other
derivatives are available for
other graphing modes
(parametric, polar, etc.).